<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8"/>
        <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
        <meta http-equiv="X-UA-Compatible" content="ie=edge"/>
        <title>Document</title>
        <script>
            // alert(typeof Array);
           /*  var arr = new Array();
            var d = new Date();
            var str = new String(); */

            var arr1 = new Array(10, 20, 30);
            var arr2 = new Array(40, 50, 60);
            alert(arr1.push === arr2.push); //true
        </script>
    </head>
    <body>
        
    </body>
</html>